Zebediah Figura : ntdll/tests: Fix test_user_apc() on i386.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6775a20f4e58d07e166438f99f92143b288e4967
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=6775a20f4e58d07e166438f99f92143b288e4967

Author: Zebediah Figura <zfigura at codeweavers.com>
Date:   Sat Jun 25 20:05:54 2022 -0500

ntdll/tests: Fix test_user_apc() on i386.

---

 dlls/ntdll/tests/exception.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/dlls/ntdll/tests/exception.c b/dlls/ntdll/tests/exception.c
index 820e435bc1b..86f2f5d6cb2 100644
--- a/dlls/ntdll/tests/exception.c
+++ b/dlls/ntdll/tests/exception.c
@@ -8784,7 +8784,27 @@ static void test_user_apc(void)
 
     pass = 0;
     InterlockedIncrement(&pass);
+#ifdef __i386__
+    {
+        /* RtlCaptureContext puts the return address of the caller's stack
+         * frame into %eip, so we need a thunk to get it to return here */
+        static const BYTE code[] =
+        {
+            0x55,               /* pushl %ebp */
+            0x89, 0xe5,         /* movl %esp, %ebp */
+            0xff, 0x75, 0x0c,   /* pushl 0xc(%ebp) */
+            0xff, 0x55, 0x08,   /* call *0x8(%ebp) */
+            0xc9,               /* leave */
+            0xc3,               /* ret */
+        };
+        void (__cdecl *func)(void *capture, CONTEXT *context) = code_mem;
+
+        memcpy(code_mem, code, sizeof(code));
+        func(RtlCaptureContext, &context);
+    }
+#else
     RtlCaptureContext(&context);
+#endif
     InterlockedIncrement(&pass);
 
     if (pass == 2)